Alternating siphon.



J. W. COX.

ALTBRNATING SIPHON. APPLICATION FILED APR. 29, 1912t 1,040,640. Patented00t.8,1912.

2 SHEETSSHEET l.

familir J. W. COX.

ALTBRNATING SIPHON.

APPLICATION FILED APR. 29, 1012.

Patented Oct. 8, 1912.

2 SHEETS-SHEET 2.

UNlTE STATEQATENT Olillil JAMES W. COX, 0F WILMET'IE, ILLINOIS, ASSIGNORTO PACIFIC FLUSH TANK COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

ALTERNATING SIPHON.

Ltlt-Oatt).

Specification of Letters Patent.

Application led April 29, 1912.

i.atciited Oct. S, 1912.

Serial No. 693,810.

Ilo all whom it may concern;

Be it known that l, JAMES W. Cox, a citizen of the United States, and aresident ot llililmette, in the county otl Cook and State oi Illinois,have invented certain new and useful Improvements in AlternatingSiphons; and I do hereby declare that the following is a i'ull, clear,and exact description thereof, reference being had 'to the accompanyingdrawings, and to the letters of reference .marked thereon, which form apart oil this specification.

This invention relates to an apparatus designed for controlling.,r the[low oit` liquid itrom a main tank, intended to be intermit tentlyemptied or discharged, into a plurality ot' receptacles, so that suchreceptacles may be filled or charged in a predetermined rotative orderfrom said main tank or receptacle.

My improved controlling apparatus may be used wherever it is desired todistribute liquid from a central tank in a predeterruined or rotativeorder to a plurality o' receptacles or other places for the disposal ofthe liquid. The invention has been designed .more especially for use inconnection with a system for septic treatment of sewage for purifying'the same; said apparatus, when so used, being located between the septictank and, the contact or lFilter beds so as to withdraw the sewage fromthe septic tank and properly distribute the saine to said contact orfilter beds; but it will be understood thatsuch apparatus may be usedwherever it is desirable to distribute a liquid in the general mannerstated.

An appa 'atus embodying my invention embraces a plurality of deep sealsiphons, such as are shown in the prior patent to M. J. Adams, No. 760,770 of May 24, 1904, and in the prior patent to S. lV. lVliller, No.857,355, dated June 18th, 1907. In the devices shown in these priorpatents, the o peration ot the several siphons in predetermined rotativeorder is secured by means of pipe connections between the severalsiphons, and the principal object o't` the present invention is toprovide for the operation of the plurality o't' such siphons in rotativeorder without the employment of any connecting means between thesiphons,

`or by a consti'iiction in which each siphon section taken on line 'tmloi Fig. Q, oi" three siphons and associated parts constructed inaccordance with niy invention; Fig. 2 is a plan view ot said siphoiis;Figi: 3 is a detail section taken on line 3h23 o't Fie'. 2; Fio 4l is anenlarged detail section taken through the starting' bell and aircompression bell belonging' to one oi. the siphons; Fig'. 5 is a detailsectional plan view, taken on line 5 5 of Fig'. 4t. Fig. (i representstwo detail sectional views taken through the starting bell and aircompression bell and showing a inodilied form oil air venting' meansapplied tliei'eto.

As shown in the drawings, A indicates a tank which may be termed a inaindistribut ing` or dosingr tank, and which is adapted 't'or connectionwith any source supplying liquid thereto. The tank when lilled isdesigned to be emptied into a plurality ot separatc receptacles, or to aplurality o't` different places. such as filter-beds, through theinediuni oit a plurality oi. deep seal siphons, each consisting' oit adownwardly opening' bell B supported over the upper end oit a pipe C:Formingr the longer legi' oi the siphon. Said bell and thc upper partot' the pipe C constitute the shorter leg' oft' the siphon, as common indevices oit this kind. Said longer leg,4 C of each siphon communicatesat its lower end with a deep seal trap e having` an upturned outlet legC, 'trom the upper end of which the contents of the tank, flowinglthrough the siphon and the trap, discharged into a pipe or conduit Dleadingr to a suitable place for the disposal ot the liquid. The severalsiphons, as shown in the accompanying drawing, ai'e arranged in astraight line near one wall A. ot the tank A, with the discharggje pipesl`) thei'eol at right angles to said wall. `lilach ot the siphons isprovided with a vent pipe lil ot familiar construction adapted for thepurpose ot venting' the siplion after each operation thereof, in atamiliar manner. Each of said siphons is provided with a blow-oft trapot the kind shown in the prior patents to S. W. Miller No. 727,991,dated `May 12, 1903, and No. 857,355 dated .l une 18th, 1907; the siphonbeing brought into operation by pressure 'from a starting bell which isconnected with the blow-ott trap, such pressure acting on the blow-oli1trap to torce or blow the seal ot the latter. As shown, the blow-offtrap of each `siphon comprises an upright receiving leg F rising intoand opening at its upper end into the upper part of the bell, or shorterleg of the siphon, at a distance above the upper end of the longer leg Coit the siphon, an outer or discharge leg F connected at its lower endwith the inner leg by a short transverse pipe f and opening `at itsupper end into the atmosphere at a point above the maximum liquid levelin the tank, and a drain pipe F2 is connected with the leg` F below theupper end of the latter and discharging into the outlet from the deepseal trap. Each blow-off trap also has connected vwith it an uprightpressure-transmitting pipe l-l, connected at its lower end with thelower ends of the pipes F and F', through which pressure is applied tothe blow-off trap to torce or break the seal of the same.

Pressure tor breaking the seal ot the blowolf trap is furnished by meansof a starting bell G, `which is located in the tank A, and with the topof which the pipe H is connected by means of a pipe H which rises fromthe top ot the bell G and is connected by a horizontal pipe 7L with theupper end of said pipe H. Said starting bell G is constantly orpermanently sealed by means of liquid held or contained in a cup l,supported beneath and adjacent to the lower margin of the bell G. rllheside margins of said cup rise above the lower margin of said bell G, sothat the said lower margin of the bell extends downwardly into theliquid in said cup and the bottom of the bell is constant-ly sealed bysuch liquid. ln connection with the starting bell G thus arranged, isemployed an air co-mpressing bell J, also located in the tank A, andhaving connected with its top an air discharge pipe J which risesvertically within the starting bell, to a point near the top of thesaine, and is then extended downwardly and has its open end locatedbelow the level of the upper edge of the cup I.

`While the air compressing bell J may be located at any suitable pointin the tank, below the level of the starting bell, in the particular'construction shown in the drawings, such air compressing bell is formedby a cylindric flange extending downwardly from the bottom of, and madeintegral with, the sealing cup l. These parts are so arranged that eachtime the water rises in the tank, air compressed in the top of the bellJ by the rising of the water therein, passes therefrom through the pipeJ and is delivered into the starting bell. The air discharged from saidpipe J rises through the water contained in the starting bell andaccumulates in the top of said bell, displacing the water in said bell,so that the water level in the bell descends or is depressed to acertain extent each time the water rises in the main tank. As the waterin the starting bell is depressed, the air pressure therein increases,until there is produced in the pressure-transmitting pipe H of theblow-ott1 trap, the degree of pressure required to break the seal ofsaid blow-ott" trap and start the main siphon in operation, as will behereinafter more particularly described.

rlhe three main siphons shown, indicated in the drawings, as No. 1, No.2 and No. 3,

are alike and each similarly equipped with g5 a blew-off trap, astarting bell and an air compressing bell, arranged and connected asabove described.

Referring now to certain differences in the construction` ot thestarting bells of the three siphons shown, the starting bell of siphonNo. 2 is provided with an air cock L located at its side at a distancefrom the bottom equal to one-third of the vertical height ot the bell,and the starting bell of siphon No. 3 is provided with an air cock Mlocated in its side wall at a distance from its bottom equal totwo-thirds of the height of the bell. ln the operation of the threesiphons, these air cocks are kept closed and 10o the same are 'used onlyin preparing the three siphons for operation alternately or in rotation,as hereinafter described. Air cocks K, l, K2 are also providedA at theupper ends otl the pipes H of the several siphons. Said air cocks K, K,K2 are kept closed in the usual operation of the apparatus and areemployed only to permit one of the siphons to be thrown out of actionwhen desired, the opening of one of said air cocks preventing theoperation of its associated starting bell. 1t is to be understood inthis connection that the two starting bells Nos. 2 and 3 in theapparatus shown, are

greater or less number of siphons is used,

the several starting bells will have their air vents arranged tocommunicate with the interior of the bells severallyat vertically spacedpoints corresponding with the number of siphons in the apparatus. Withonly two starting bells one of them will have its air vent locatedmidway of its height, but where four siphons are used, three of thebells will have air vents located one at three-fourths, one atone-halt', andthe other 130 at one-fourth of the height of the bell fromthe level of the bottom of the same.

As shown in the drawings, each of the air compressing bells J is madedeeper than required for the operation of its associated starting belland is provided with one or more valved vents, as N, N, N2, in its sidewall, either of which, when open, will prevent any compression of air insuch air compressing bell, as the water rises in the tank, until thelevel of the water reaches the level of the open vent. This constructionprovides for throwing one of the main siphons out of operation whendesired, as will hereinafter appear.

The drawings, Figs. et and 5, show a convenient construction in meansfor adjustably supporting the sealing cup I, and compressingr bell J,from the starting bell G; such suijiporting means consisting ofoutwardly extending' lugs g, y] on the lower margin of the bell G,inwardly extending arms 2', z on the upper margin of the cup I, arrangedwith the inner ends above and overlapping the lugs g, g, and set-screwsv, z" inserted vertically through said arms and bearings)` at theirlower ends on the lugs. This construction provides for accuratelyadjusting the level of the top margin of the cup relatively to that ofthe bottoni margin of the starting` bell, so as to afford the necessarydepth of seal in said cup to prevent the entrance of air to, and theescape of water from, the sealing bell, when the tank is empty.

The operation of a series of alternating siphons embracing` the featuresof construe tion above described, is as follows: In order to prepare foroperation the starting bells of the three siphons shown, all of thebells being' empty, and all of the blowoff traps and all of the mainsiphons being filled or sealed with liquid, one of the bells is filledone-third full of water, another one twothirds full and the third isleft empty; it being understood that, as each startingbell is sealed bythe water in the cup into which its lower edge dips and as thepressuretransmitting` pipe connected with the top of each starting);bell is sealed by the water in the blow-off trap, so that air cannotenter the top of the bell, the water introduced into either startingbell before starting the apparatus will be retained therein byatmospheric pressure. Different quantities of water may thus beintroduced into the starting bells of siphons Nos. 2 and 3, in anydesired manner, butl in the construction shown, the two air cocks L andM, on said starting bells, located in one instance in the side of thestarting bell at a distance onethird of the heightof the bell from itsbottom, and in the other instance two-thirds of the distance from thebottom are utilized forintrodiulcing the desired quantities of waterinto said starting bells during the operation of filling' the main tankthe first time. Assuming that the main siphons and blow-ofi' traps havebeen primed, and the air cocks L and M of siphons Nos. 2 and 3 are open,if water be allowed to flow into the main tank, as its level risestherein, it will overflow the edges of the cups and seal the threestarting,` bells. As the level of the water rises, after the cups havebeen filled and the starting bells sealed, the water will riso only ashort distance in the starting bell of Siphon No. l, because of the factthat the escape of air from that bell is prevented by its sealedblow-off trap, but in the case of the starting` bells of siphons Nos. Qand 3, the air will at this time escape through the air cocks L and M,and the water will rise equally in said starting bells and in the tank.lV hen the level of the water in the starting bell of siphon No. 2reaches the air cock L, that air cock will be closed by hand to prevent-Afurther escape or entrance of air, and the blow-ofi' trap being sealed,the air held in the bell will prevent any more water entering the same.Likewise in the case of the starting bell of siphon No. 3, having itsair cock M at two-thirds of the distance from its bot-tom, when thewater in the bell reaches the level of the said air cock the same willbe closed by hand and no more water will enter the said bell. The threestarting bells of siphons Nos. l, 2 and 3 will now be prepared for thefirst operation of the apparatus in emptying the tank. ln the case ofthe starting` bell of siphon No. l, in which the water rises in the bellonly a short distance, as stated, the further rise of the water in thetank after the sealing ot the bell, will have the efl'ect of compressingthe air therein to a degree correspondingwith the height of the water inthe tank, and when the water reaches its maximum level, the pressuredeveloped in said starting bell of siphon No. l, will be suflicient tobreak the seal of its associated blow-off trap and start said siphon No.l. in operation. Each starting bell is so arranged or its lower edge islocated at such distance below the maximum level of water in the tank,that a suflicient air pressure to break the seal of the associatedblow-oft` trap will be obtained when the level in the water in thestarting bell depressed to a point near the bottom edge of the bell;that is to say, before the main siphon will be vented, the column ofvater-.in the pipe H of the blow-off trap must be lowered until its topreaches the lower end of said blow-off trap. As the water is depressedin the pipe Il, it will rise in the pipe F and escape through the drainpipe F2, and when the level of the water in said pipe reaches the lowerbend of. the blow-oftl trap, the water will be forced from saidblow-ofil trap, so as to break the seal therein, and

air will then escape from the main siphon through the blow-off trap, andsuch main siphon 'will be started in operation, as is usual in theoperation of such blow-off traps. 1t will be understood that in thisfirst operation of the apparatus, the compressing bells will not comeinto operation, because, the starting bells being empty, when the waterfirst rises in the compression bells, the air will freely escapetherefrom through the pipes J. As soon as the blow-oft1 trap of siphonNo. 1 is unsealed, as described, the air in the starting bell of saidsiphon will escape therefrom through the'blow-oif trap, and water willinstantly enter and fill said starting bell, entering the bottom of thesame through the sealing cup, and immediatel y upon the starting of themain siphon, by the venting of the same through the blowoff trap, waterwill enter the blow-off trap through the top of its receiving leg F,thereby again sealing the said blow-off trap. It follows that, as thelevel of t-he water in the tank subsequently descends in the emptying ofthe same, and after the tank is empty the start-ing bell of siphon No.1, will remain filled with water. r1`his is the condition of theapparatus after the first operation of siphon No. 1, and when the tankis empty, as shown in Fig. 1 of the drawings; the starting bell ofsiphon No. 1 being at this time completely lled, that of siphon No. 2one-third filled and that of siphon No. 3 two-thirds filled. Vhen thewater rises in the tank in the next and subsequent operations of theapparatus, t-he compressing bells come into operation.

lt being understood that each air compressing bell is adapted to containa quantity of air suiiicient to depress the level o-f the water in itsassociated starting bell a distance of one-third of the height of thebell, it follows that each time the water rises in the tank, the waterin such starting bell will be displaced to an extent equal to onethirdof the quantity of water contained in the bell when the same iscompletely filled. if, therefore, one of the starting bells be one-thirdfilled, as in the case of the starting bell of siphon No. 2, after thewater first rises in the tank, when the water level next rises, the airforced from the compressing bell of said siphon No. 2 will force thewater therefrom and give such increased pressure in said starting bellas to break the seal of its associated blow-off trap and start siphonNo. 2 into operation. Likewise, in the case of the starting bell ofsiphon No. 3, which in starting the apparatus was filled two-thirds fullof water, when the water rises the second time in the tank, the airforced into said starting bell will displace a quantity of watertherefrom equal to onethird of its capacity, leaving it one -thirdmaximum level in the tank, the pressure developed in the starting bellwill be sufficient to force the seal of the associated blow-od trap andstart the main siphonNo. 3 into operation. Assuming that either startingbell is full of water, as in the case of the starting bell of siphon No.1, as shown in the drawing, the water in the tank will rise three timesbefore all of the water will be displaced from said lled starting bell,and the venting of the main siphon associated therewith will take placeafter the water in the main tank has risen three times, with the effectof forcing all of the water from such starting bell, and suflicient airpressure will then have been developed to break the seal of the blow-offtrap and thereby start the associated main siphon in operation. In caseof a starting bell which, when the tank has been emptied, is lled onlyone-third full of water, such water will be displaced and its mainsiphon will be started when the water rises once in the tank, andlikewise, in the case of a starting bell which, when the tank is empty,is two-thirds filled wit-h water, all of the water will be forcedtherefrom and its main siphon will be started in operation when thewater so rises the second time.

1t follows from the above that after the three siphons are in operation,in the manner stated, each time the water rises in the tank, that one ofthe starting bells that is filled with water will have one-third of thewater forced therefrom, that one of the starting bells that istwo-thirds full will have the level of the water therein depressedcorrespondingly, and the start-ing bell that is one-third full will havethe water level lowered to t-he bottom of the bell, and sufficient airpressure will be developed therein to start its associated main siphoninto operation. As soon as the seal in either blowolf trap is broken andair permitted to escape through such blow-0E trap from its associatedsiphon, the breaking of the seal in the blow-off trap will not onlyallow the air to escape from the top of the main siphon, to start thesame in operation, but the air will also escape from the top of theassociated starting bell through the blow-off trap, thereby permit-tingthe surrounding water to flow into such starting bell through its cupand completely fill the same. /Vhen the water in the main tank nextrises, onethird of the water will be forced from such lled starting belland the operation will continue as before; the starting bells of thethree siphons operating successively, each time the water rises in thetank, to vent one of the main siphons and effect the emptying of thetank.

As before stated, the effective depth of the air compressing bell may bechanged by opening one of the several air vents N, N, N2, located atdifferent distances below the top of the said bell, so that either aircompressing bell may be adapted to force a sufficient quantity of airinto its associated starting bell to force all of the water from thelatter in two, three, four or more operations of the compressing bell,according to the number of siphons to be operated. The air compressing'bells illustrated, when all of the air vents N, N', N? are closed, willhold sufficient air to displace one-half of the water in a filledstarting bell, and when the vent N is open, will contain a quantity ofair required to displace onethird of the water in a filled startingbell. If it be desired to cut out of operation one of the` three mainsiphons illustrated, then all of the vents on the air compressing bellsof the other two siphons will be closed, whereupon, each time the waterrises in the main tank, one-half of the water will be forced from thestarting bells of the siphons that are in operation, each of the twosiphons will be operated after the water has risen twice in the tank andsuch two siphons will operate in alternation with each other. One of thevents N or N2 will be used in case the apparatus is provided with fouror five siphons in which case the water will rise four or five times inthe tank to effect the operation of either starting bell.

It will be understood that the pipe J, leading` from the top of thecompressing bell and discharging at the level of the bottom of thestarting bell, is arranged to rise to a point near the top of saidstarting bell, and then descend, in order that the water may be retainedin said starting bell by atmos pheric pressure when the tank is empty;it

eing obvious that the pressure of the atmosphere will act downwardly onthe top of the water in the descending leg of said pipe J, in the samemanner as it acts on the top of the water in the exterior' part of thecup I, to prevent the water in the starting bell from flowing outwardlythrough the said pipe J. Said pipe J may be arranged otherwise than asshown, provided it has a rising and descending leg and has itsdownwardly opening end approximately at the level of the bottom edge ofthe starting bell or below the surface of the water in the sealing cup.

In Fig. 6, I have shown a construction in means for introducing theproper quantity of water into two of the starting bells, adapted for usein place of the air cocks L and M, hereinbefore described. As shown insaid figures, O and P are two small vent pipes, attached to the startingbells and connecting with the upper parts of the interior of the same.Said pipes and l are of inverted U-form having their lower bends bclowthe levels of the bottom edges of the starting bells, and consisting oflonger de scending legs and shorter rising legs; the ends of the risingllegs being open. The vent pipe O' has the open end of its rising leg ata vertical distance from the bottom of the bell, equal to two-'thirds ofthc height of the same. The vent pipe' I has its open end at a verticaldistance from the bottom of the bell equal to one-third of the height ofthe same. The vent pipes t) and I, arranged as described, operate.uitolnatically, when the starting bells are being filled in preparationfor operation, to give the desired quantities of water in theirassociated starting bells. As the water level rises in the tank andenters the starting bells through the cups thereof, air will escape fromthe tops of the bells through said pipes O and I), until the water levelreaches vthe upper ends of said pipes, when the same will be sealed bywater which will then flow into such open ends, the escape of air willbe cut oli", and no more water will enter the bells. During the usualoperation of the apparatus, these vent pipes will remain sealed, and thestarting bells will operate in the same manner as is the case with thestarting bells of Figs. l to 5, when the air cocks Il and M thereof areclosed.

It will be understood that the air compressing' bells, while they may belocated elsewhere than beneath the starting bells, must necessarily belocated below the level of the said starting bells in order that theymay be subject to the greater water head or pressure than that withinthe starting bells` so that the air pressure developed in the startingbells will be sullicient to force the water therefrom.

An apparatus embodying my :invention may be variously modified in itsdetails of construction and in the arrangement of its parts, and I donot desire to be limited to the special features of constructionillustrated, except so far as the same may be pointed out in theappended claims, as constituting parts of my invention.

I claim as my inventionl. An apparatus for the purpose set forthcomprising` a tank, a plurality of trapped siphons, a blow-ottI trapcomnulnicating with the air space of each siphon above the seal thereof,a constantly sealed starting bell for each Siphon, the air space ofwhich hell is connected with the blow-oil' trap of said siphon, andmeans associated with the starting bell of each siphon operated hy therise of liquid in the tank and acting each time the liquid rises in thetank to deliver' to said starting bell a quantity 'of air less than thatrequired to give therein a pressure sufficient to break the seal of itsassociated blow-off trap.

2. An apparatus for the purpose set forth, comprising a tank, aplurality of trapped siphons, a blow-off trap for each siphon connectedwith the air space of said siphon above its trap, a constantly sealedstartingbell for each siphon connected with the blowoff trap thereof,and an air compression bell for each siphon adapted for the discharge ofair into its associated starting bell.

3. An apparatus for the purpose set forth, comprising a tank, aplurality of trapped siphons, a blow-off trap for each siphoncommunicating with the air space of the same above its trap, a startingbell for each Siphon, provided with a cup adapted to contain liquid forsealing the bell, said bell being connected with its associated blow-offtrap, and an air compressing bell for each Siphon adapted for thedischarge of air into its associated starting bell.

4;. An apparatus for the purpose set forth, comprising a tank, aplurality of trapped Siphons, a blow-off trap for each siphoncommunicating with the air space of the same above its trap, a startingbell for each siphon provided with a cup adapted to contain liquid forsealing the bell, said bell being connected with its associated blow-offtrap, and an air compressing bell for each Siphon adapted for thedischarge of air into its associated Starting bell, one or more of saidst-arting bells being provided with a valved vent opening therefrombetween its top and bottom.

5. An apparatus for the purpose setI forth, comprising a tank, aplurality of trapped siphons, a blow-olf trap for each sip-honcommunicating with the air space of the same above its trap, a'startingbell for each Siphon provided with a cup adapted to contain liquid forsealing the bell, said bell being connected with its associated blow-offtra-p, and an air compressing bell for each Siphon adapted for thedischarge of air into its associated starting bell, all but one of saidstarting bells being provided with valved vents opening` from the samebetween its t-op and bottom at points spaced vertically to correspondwith the number of main siphons in the apparatus.

6. An apparatus for the purpose set forth, comprising a tank, aplurality of trapped siphons, a blow-ofip trap communicating with theair space of each Siphon above its trap, a constantly sealed startingbell connected with the blow-Gif` trap of each Siphon, an aircompressing bell connected with the starting bell of each Siphon, eachof said air compressing bells being of such capacity in proportion tothat of its associated starting bell that the quantity of air deliveredtherefrom to the starting bell at each rise of liquid in the tank willbe such that the air compres sion bell will operate a number of timesequal to the number of main siphons in action before the amount of aircompression in said starting bell will be su'liicient to break the sealof its associated blow-oit trap.

7 rlhe combination withatrapped siphon, of a blow-off trap, a constantlysealed starting bell connected with said blow-oif trap, an aircompressing bell, and an air delivery pipe connected with the aircompressing bell, said pipe having a rising and a descending leg andhaving the lower or eXit end of its descending leg located below thelevel of the top of the sealing cup.

8. The combination withatrapped Siphon, of a blow-off trap and aconstantly sealed Start-ing bell, said trap comprising an upright pipecommunicating at its top with the air space of the siphon above itstrap, an upright pipe connected at its lower end with the first-namedpipe and opening at its upper end to the atmosphere above the level ofthe liquid in the tank, and a U-shaped pressure-transmitting pipeconnected with the lower ends of the two-first mentioned pipes, and withthe top of the Starting bell.

9. rIhe combination witha trapped Siphon, of a blow-olf valve, astarting bell connected with the blow-olf valve, a cup surrounding thelower margin of the starting bell and an air compressing bell providedwith a discharge pipe for delivering air to the Starting bell, said aircompressing bell being formed by a depending flange on the bottom ofsaid cup.

10. As a means for producing air pressure through'the rising and fallingof the level of a body of liquid, a bell provided with a passage leadingfrom its top to the space in which air pressure is to be produced, a cupsupported beneath the said bell and adapted to contain liquid to sealthe bell, and an air compressing bell adapted to discharge air into thefirst-named bell.

l1. As a means for producing air pressure through the rising 'andfalling of the level of a body of liquid, a bell provided with a passageleading from its top to the space in which air pressure is to beproduced, a cup supported beneath said bell and adapted to containliquid to seal the bell, an air compressing bell, and a pipe leadingfrom said air compressing bell and discharging into the first-namedbell.

12. As a means for producing air pressure through the rising and fallingof the level of a body of liquid, a bell provided with a passage leadingfrom its top to the space in which air pressure is to be produced, a cupsupported beneath said bell and adapted to contain liquid to Seal thebell, an air compi'essing bell, and a pipe leading from seid as myinvention I allix my signature in the air compressing bell anddischarging into presence ci' two witnesses, this 26th day of Jchefirst-named bell, said pipe liavmg a rls- April, A. D. 1912,

ing and a descending leg, und having the JAMES WV. COX. 5 discharge endof its descendingleg located llfitnesses:

below the liquid level in seid cup. EUGENE C. MANN, In testimony, thatI, claim the foregoing CMAS. W. POOLE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner cf Patents, Washington, D. C.

